Buzzwords
Endorsement = The action of publicly declaring one’s support
Also see: awards, recommendations, testimonials, advertising
A retweet may not always equal an endorsement, but it certainly can carry a lot of weight.
Examples of endorsements
http://www.tomohalleran.com/about-tom/endorsements
Tweets as endorsements/recommendations
Related: Undorsement
1. to make public one’s negative opinion of (a politician, cause, product, etc.).
2. (of a celebrity) to agree not to be associated with (a product), usually for a fee, because their public image is considered detrimental to its sales.
Macquarie Dictionary
Amazon.com
https://affiliate-program.amazon.com/help/node/topic/GHQNZAU6669EZS98
Embedded Tweets
Wikipedia
Endorsement
Planeta.com