Twitter...?
I saw an article saying that Twitter is still ad-free...but probably won't stay that way. So I'm thinking, maybe I should get a Twitter account just so I HAVE one. I wouldn't use it, but I'd hate to end up needing one later and being stuck with some sort of second-class ad-covered account because I was a late adopter.

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Actually Twitter, from some reports, is dying, but lying about it. They count millions of inactive accounts (like LJ has and does) that haven't been used in months, as being users.
Since the use of it for advertising via messages has escalated more folks are dropping it. Its not the next great thing, from what I'm hearing, and many early adopters of it have dropped it entirely.
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What I do mind is obnoxious advertising like pop-ups and pop-unders and spam and nasty stuff. The wildly inappropriate or confused ads and recommendations are more of an amusement. Hmm, and excessive Flash animations can be problematic for those with slower connections; can a person on dial-up even remotely effectively surf the web these days?