Twitter is losing out even with celebs.

Surprisingly because many are using WhoSay -- http://whosay.com/ -- which integrates seamlessly with Twitter. 

Twitter is trending down but Facebook is trending up:

You can draw that conclusion after looking at data from WhoSay, a startup that’s supposed to help famous people manage, and eventually profit from, their social media postings.

Here’s a chart that shows the different platforms WhoSay’s users have been posting on over the past two years. Note that Twitter remains the dominant platform, but that its use appears to be trending down a bit. Facebook, meanwhile is on the rise — as are TenCent and Instagram.

It’s possible that Facebook’s rise has something to do with its efforts to court and reward celebrities for posting there. But it’s more likely that this has more to do with the kinds of things celebrities post.

Twitter still owns text posts but Facebook and Instagram are gaining in other media:

If they’re just typing up a message, without adding pictures or videos, then Twitter’s share looks largely unchanged over the last two years, WhoSay says:

But when they have images and/or moving pictures to share, then Facebook looks nearly as attractive as Twitter. And so does Instagram, which means Mark Zuckerberg is doing very well, famous people-wise: