Brand champ update you for every campaign once you completed registration on their site.Like below image and you have to ready on that particular day to participate campaign
You can also connect with brands directly without any third party intervention but i have been working as influencer for brands thru Brandchamp website.
1)More than 500 followers in twitter
2)Regular twitter presence and tweeting
Higher the social media , higher the chances of success in influencer marketing
To Register in brandchamp click here