Database.com Chatter REST API Developer's Guide - Salesforce.com

Chatter API: How do I. . .
HTTP method:
Request body:
Request body example:
POST
The appropriate container input, such as comment input or feed-item input, with the message
segment input: mention
{ "body" :
{
"messageSegments" : [
{
"type": "mention",
"id" : "005D0000001GpHp"
},
{
"type": "text",
"text" : " Did you see the new plans?"
}
]
}
}
Note: No spaces are added either before or after the @mention, so the text message
segment includes a space.
Returns
Feed Item
Post multiple @mentions
Resource:
HTTP method:
Request body:
To post a feed-item with multiple @mentions, use one of the feed resources, such as
/chatter/feeds/user-profile/userId/feed-items. To post a comment with
multiple @mentions, use the Feed-Items resource:
/chatter/feed-items/feedItemId/comments.
POST
The appropriate container input, such as comment input or feed-item input, with multiple
Message Segment Input: Mention bodies.
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