Facebook offered $500 Million, Microsoft have hinted at it, and Google offered stock in addition to cash. It would seem every big player has attempted to buy Twitter, and the latest rumor circulating the web is that Apple are interested in acquiring the San Francisco company.

Various sources hint that Apple are in “late talks” with the company, and hoping to announce the acquisition, if successful, at the upcoming WWDC this June. All of this comes after Twitter made it perfectly clear that they currently have little interest in being snapped up.

Evan Williams tweeted yesterday that he had some “tough decisions” to make, so who knows whats in store. But for now, this is purely just a rumor.

A few days ago Twitter announced, via the API Wiki, that a “Sign in with Twitter” feature was now available. This sign in feature will allow users to sign into (participating) third-party sites with their Twitter login information. This release of this service can be seen as a direct response to the similar services offered by Facebook and Google. Facebook’s service “Facebook Connect” seems to be missing a trick, as where as Twitter’s solution is realtively an ‘open’ solution, Facebook Connect comes with a long list of do’s and don’t for those implementing it.

For those of you who use both Twitter and social networking site Facebook, it will be pretty clear that recent changes to the Facebook platform seem to be following in Twitter’s footsteps, and now it would seem it has gone one step further, as now Facebook recommends befriending celebrities to your account, via fan pages.

This move of course mirrors that of Twitter’s recommendations available upon signing up, and via the ‘suggestions‘ page. Now, imitation apparently is the highest form of flattery, so Facebook’s moves may be seen as simply improving the user experience, although one thing is for sure, I would suggest they change the terminology used, as for example, do I really know U2?