Overview
Since JomSocial 2.8 onwards, we bring the massive change in how activity streams are handled and introduce a set of new rules to follow which will allow more freedom for third party developers to easier customize every individual's activity stream item;
JomSocial 2.8+ streams are NOT backward compatible with JomSocial 2.6 and bellow, however, some legacy support for old activity stream exist in JomSocial 2.8 and above. This does not necessarily mean your old activity will work though.
You can still use the old API to create the activity streams, but you can't use the {multiple}...{/multiple} tags anymore as they are completely removed and will cause activity streams to break. (It will be created, but will not be shown on Front End).
Storing & Displaying
Unlike JomSocial 2.6where third party activity stream were created by JomSocial APIv1 and