I would say the best method to grow your Bitcoin would be using your BTC to start a gambling site, since 50% of Bitcoins economy is gambling...it would definitely profit you.
nah gambling is not good anymore, it's better to offer something like signatrue campaign but for other forum as well and not limited only here
if every forum, not only those that talk about bitcoin, but any kind of forum offer this service, bitcoin would gain an enourmous traction