"join discussion" is correct and usable in written English.
You can use it when you wish to encourage someone to participate in a discussion, typically one that is taking place online. For example: "We encourage you to join the discussion on our company's forum to share your thoughts and ideas."
Visitors will receive garlands from "Bollywood girls," join discussion groups, take dancing lessons and observe the traditional 16 steps of Indian dressing.
It's also possible to join discussion groups, view rankings of popular videos and dig up videos that are similar to the listed one (and share the relevant video, too).
The Kobo Pulse integration lets you detect and join discussion of passages and pages as you read them, and the Vox is the first e-reader to get Facebook Ticker integration.
For more professional profiles, on LinkedIn or XING for example, you can simply post links to relevant articles to create a presence for yourself or join discussion groups and participate — professionally — in conversations that apply to your line of work or expertise.
Conception of the work came from join discussion between MSF and AHB.
Post questions and comments on topics that interest you or join discussion forums.
They wonder whether people will really volunteer to provide examples of prior art, join discussions, and so on.
Women could buy books, take writing workshops and join discussions on political and current events with other women, Ms. Bruckman said.
The social nature of Twitter means you can ask questions, have conversations, and join discussions or debates.
The governor invited the Republican senators to join discussions in his office Wednesday morning with Democratic legislative leaders.
Users can follow their favorite teams, receive updates, and join discussions about them.
