ReadWriteWeb

Did you know that your tweets have an expiration date on them? While they never really disappear from your own Twitter stream, they become unsearchable in only a matter of days. At first, Twitter held onto your tweets for around a month, but as the service grew more popular, this "date limit" has dramatically shortened. According to Twitter's search documentation, the current date limit on the search index is "around 1.5 weeks but is dynamic and subject to shrink as the number of tweets per day continues to grow."

What that means is something tweeted prior to a week and a half ago can never be retrieved via search.twitter.com. That's bad for users and it's definitely bad for data-mining. Unless Twitter corrects this issue on its own, we have to find another solution for archiving tweets ourselves. Here are 10 ways to do so.

It's going to be a little like the Brady Bunch, this union between Facebook and the just-acquired social networking service FriendFeed. Both families will influence each other a lot, though Facebook is far, far bigger. (The youngest one in curls!)

FriendFeed was co-founded by Paul Buchheit, the man who invented GMail, and by Bret Taylor, who co-founded Google Maps. They both made enough money from being early Google Employees that they never needed to work again and didn't need to sell to Facebook - but they joined Facebook because they wanted the work they'd done on FriendFeed to change the world of social networking. Here's what they bring to Facebook; it's probably going to change Facebook a lot.

Earlier today, rumors started to appear that FriendFeed had been acquired by Facebook. We now have confirmation that this is indeed true. Neither Facebook nor FriendFeed released any exact details about the acquisition, but we'll keep this story updated as we learn more details about this acquisition. According to a post by Bret Taylor on the FriendFeed blog, FriendFeed will continue to operate normally for the time being while the two companies figure out the long-term plans.

Yesterday, Twitter, Facebook, LiveJournal, and Google's Blogger were targeted by a person or persons unknown, in a denial-of-service attack (DDOS) that attempted to silence the voice of one individual. The target in question was a Georgian blogger who goes by the name of "Cyxymu" online, according to recent reports from CNET. While Google withstood the attack, the other services suffered. LiveJournal and Twitter went down completely and Facebook struggled throughout the day.

As we now roll into day two of the "great social media outage of 2009," you may be surprised to learn that it's not over yet. Although Facebook and LJ have recovered, Twitter is still having issues. Not only was the site down once again early this morning, Twitter developers using the API are complaining that the company is sending mixed messages by reporting that they're "back up" - when in reality many Twitter applications are still unusable.

Augmented reality -- or the addition of a layer to the world before your eyes (aka the "real world") using technology -- is the next big tech trend. Already making its debut in everything from mobile apps to kids toys, "AR" will clearly soon be talked about by everyone the way they used to talk about "social media" and "Web 2.0" before that.

While augmented reality has its uses -- although many of them just involve oohing and aahing at nifty apps -- this trend is already in danger of being over-hyped, even though it has barely gotten off the ground.

Only 5% of Twitter's users account for 75% of all the activity on the service, and almost one third of all the tweets posted by the most active users come from bots that each generate more than 150 tweets per day. According to a new report from Sysomos, the up-and-coming social media monitoring and analytics service, one quarter of all the messages posted on Twitter are currently generated by bots. Some of these are obviously spambots, though a large number of bots are also run by legitimate organizations, including @diggupdates, @imdb, and @dogbook, which posts updates from pets on Facebook to Twitter.

Recently Tim O'Reilly and John Battelle released a white paper entitled Web Squared: Web 2.0 Five Years On. It focuses squarely, pardon the pun, on the intersection of social web technologies with the emerging Internet of Things (real world objects connected to the Internet).

The 'web squared' moniker is, commercially speaking, a none to subtle attempt to re-brand web 2.0. This had to be done so that the conference series of that name, which O'Reilly and Battelle jointly run along with the company TechWeb, remains relevant. But less cynically, the report also nicely applies Web 2.0 principles onto the emerging Internet of Things.

The US Securities and Exchange Commission is considering a ban on a stock market practice known as "flash trading," where supercomputers get access to information milliseconds before other traders and can rapidly buy and sell in ways that are argued to influence the market unfairly - thus discouraging mere mortals from participating.

Many bleeding-edge trends in the consumer web play out writ large in financial markets; as all of us look at the growing prominence of real-time information on the web, the debate over flash stock trading raises issues worth considering outside the stock markets as well.

Yahoo's social bookmarking service Delicious launched a new home page this morning, combining recent tagging activity and cross-referenced links on Twitter to deliver what it calls the hottest news from around the web in real time. While the exact formula behind the front page remains unclear, its contents are clearly changing minute by minute.

It is something the site probably should have done a while ago and if done correctly could make other services, like Digg, look all the more behind the times. The move could also help Delicious survive the coming Yahoo Search purge at the hands of Bing.

One year ago we reported that music-based social networking site Imeem was experiencing strong growth and making key deals with record labels. Our conclusion at the time was that "Imeem's growth rate and buzz is reminiscent of that of YouTube just before it got huge."

Big words indeed. To see if that You Tube comparison was justified, let's check back in with Imeem one year later and assess how they're doing now.