The rules here (https://support.twitter.com/articles/76915) say that an app cannot send unsolicited direct messages. We have, so far, respected all the rules stated in the aforementioned link by explaining to our users that they might be receiving bulk direct messages.
We are the organizer of TREC Real-Time-Summarization Track, a research track that benchmarks different information retrieval systems around the world. You can find more details about the track here: http://trecrts.github.io/. The track has already begun, but the access token gets deleted frequently and the app gets revoked. We also tried to contact the Twitter support but could hardly connect to them. We would very much appreciate it if you can look into this issue immediately.