01-15-2013 01:06 AM
Twitter currently owns the patent application for 'pull down to refresh'. They can't exercise the patent until their patent application is accepted by the patent office, which apparently usually takes a number of years (not sure when the patent application is from, it's probably already a couple years old).
In any case, I believe they've said they do not plan on exercising the patent (I have no source on this information and it might not be true).
01-15-2013 01:24 AM
do a search in the forums, you'll find a few posts on how to do that...
here's one of them: