I dont know about other promotional activities but I am really satisfired with @Viberate
Here is my reward from @Viberate for 2 months of participating in their promotional activities.
ACCOUNT BALANCE
2897.12842744 VIB
It is also very simple to participate. All you have to do is register on their site. Activate your social media accounts (confirm). And start promoting them. You can also earn VIB's by filing database with artists, venues, events and much more.
Register here: https://www.viberate.com/referrals/d1f2a5c4_531fee4e_af6ca673
Read more about participating here:
https://blokt.com/icos/viberate-ico-review
https://bitcoinmagazine.com/articles/vibrant-community-viberates-key-ico-and-product-success/
http://www.metalsucks.net/2017/12/11/viberate-rolls-out-a-rewarding-system-allowing-music-fans-to-earn-crypto/
Current VIBe price:
$0.531671 USD
0.00003849 BTC
0.00039842 ETH