HelloTxt is a free online service to update multiple social networks together. It can update Facebook, Twitter, Friendfeed, LinkedIn, Tumblr, Posterous, and more. More than 40 networks are supported. Whenever you post your message using HelloTxt, you can choose the message to be posted on all your social networks together.
Update (2-Sep-2012): HelloTxt website is not available anymore.
HelloTxt is an online service, and completely free. You do not need to download or install anything to use it. To sign up for this service, you can create a free account, or simply login with Twitter or Facebook account. After that, you start adding all the networks that you want to integrate in HelloTxt.
Here are some of the social networks supported by HelloTxt: Twitter, Facebook, LinkedIn, FriendFeed, MySpace, Google Buzz, Identi.ca, Foursquare, Flickr, LiveJournal, Orkut, Posterous, Delicious, and many more.
Once you have integrated your social networks in HelloTxt, you can read streams from all of them in one place. Of course, the most interesting feature remains that you can update status on all social networks together. Also check out Cliqset, and Nomee.
HelloTxt also lets you update status via email, and also provides free iPhone and Android apps to update status from your smartphones.
HelloTxt is a good replacement for Ping.fm. I think it has become even better than that, as it also lets you check status updates from different social networks, instead of just posting to them. Only feature I find missing is RSS to Twitter feature that Ping.fm provides. I hope HelloTxt catches up to that.
If that is not a deal breaker for you, go ahead and check out HelloTxt, and start managing all your social networks from one place. I am glad products like HelloTxt and Ping.Fm are letting us do that :)