bountyhive is now very famous, they are a team that provides a variety of bounty places, and very many ico programs that they promote success, but I suggest you should follow the signature campaign only, because for social media like facebook and twitter, has very many participants, so the reward will be very little
you are right, bountyhive is already widely used by the project and many are successful, although i never join in bountyhive but i am sure it will be safe, so go ahead