It's more or so a known fact that the apps we use like Facebook and all , do sell the user's data to the government of different nations
I don't think it's a case of selling data. They sell data to advertisers and the like - governments simply demand the data, or pass laws requiring them to build backdoors in to their sites and software So the government can access the data whenever they like.
Since the beginning of the Silk road crimes related to bitcoin were taking place over all and I guess FBI would have been after bitcoin since then.
There is a big difference between shutting down Silk Road and attacking bitcoin itself. When the FBI bust money launders, they aren't attacking fiat as a concept.
We certainly cannot tell whether or not the FBI is interested in shutting Bitcoin down.
I'm pretty sure they aren't. They are interested in catching criminals who use bitcoin, but they don't want to attack bitcoin itself. They can't shut it down due to it being decentralized, so the best they could manage would be to ban it in the US. Doing so puts them at a massive disadvantage in using a global currency, and shuts them off from an emerging market. Doing so would give more power to countries looking to destabilize USD.