Force.com Apex Code Developer's Guide

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Differences Between ConnectApi Classes and Other Apex Classes

Please be aware of these additional differences between ConnectApi classes and other Apex classes.
System mode and context user
Chatter in Apex methods don’t run in system mode, they run in the context of the current user (also called the context user or the logged-in user). The methods have access to whatever the current user has access to. Chatter in Apex does not support the runAs system method. When a method takes a subjectId argument, often that subject must be the context user. In these cases, you can use the string me to specify the context user instead of an ID.
with sharing and without sharing
Chatter in Apex ignores the with sharing and without sharing keywords. Instead, all security, field level sharing, and visibility is controlled by the context user. For example, if a context user is a member of a private group, ConnectApi classes can post to that group. If the context user is not a member of a private group, the code can’t see the feed items for that group and cannot post to the group.
Asynchronous operations
Some Chatter in Apex operations are asynchronous, that is, they don’t occur immediately. For example, if your code adds a feed item for a user, it is not immediately available in the news feed. Another example: when you add a photo, it is not available immediately. For testing, this means that if you add a photo, you can’t retrieve it immediately.
No XML Support in Apex REST
Apex REST does not support XML serialization and deserialization of Chatter in Apex objects. Apex REST does support JSON serialization and deserialization of Chatter in Apex objects.
Empty log entries
Information about Chatter in Apex objects doesn’t appear in VARIABLE_ASSIGNMENT log events.
No Apex SOAP Web services support
Chatter in Apex objects cannot be used in Apex SOAP Web services indicated with the keyword webservice.