1. twitter
2. facebook
3. LinkedIn
4. Instagram
5. Articles (Medium/Steemit)
6. Telegram
A signature campaign will be held here at bitcointalk that can use logos of the project thats the way to promote.
Now, theres a trending in twitter that many people join and that is twitter giveaways..
I thought that there's already a massive banning on twitter accounts that are likely to be joining bounties and are just tweeting and re-tweeting for that sole purpose. I'm not aware if twitter is still intact with that incident or it's a lie-low now.