If you notice, most of the twitter pages PR is much higher compared to the original twitter page owner's website. Why are Google evaluating the twitter page higher than their original websites?
Nearly everybody links to their twitter pages, and all the links out are nofollow. That's a lot of authority twitter is keeping for themselves.
What do you expect? It has a ton of back links - from news sites - other websites - etc... Why do you care about their PR?
yeah as someone mentioned don't worry about PR. Seriously I've been in this business for many years. you will ultimately come to the conclusion that PR is not something to worry about. So you might as well stop now
Twitter is b2b site, so every business is connected with Twitter, because of this Twitter is getting popular day by day.
Your Twitter profile page gets high page rank only when you update it frequently. Otherwise it don't receive high pagerank. Also Google treats Social media website in a different way.
They get a lot of natural link, and like someone from above has just said, all their links are nofollow, therefore their link value is kept.
don't look at pr as it is not going to matter. The all thing matter is traffic. Get traffic get popularity.
It is so because almost everyone links to their page on twitter. The amount of users on twiter are really much so you can expect good traffic from on there.
gbecause through twitter you can get natural links. its b21b site, you follow someone and someone is following you.