How to use WebCenter REST API to like or comment a activity

Hi all
I want to know how to realize like or comment function with REST APIs.
I execute a REST call with following url, but the 'like' counter is not be increased.
http://cdcjp77vm3.cn.oracle.com:8888/rest/api/activities/services/oracle.webcenter.community/objectTypes/groupSpace/objects/(s2518c69b_1989_4a63_8886_c32075c76b9c)/likes?&utoken=FDNA-Z7ekZuPnVSNoPWOqTJ2IzAE_w**
Is there anything i missed?
Can anyone give me an example about how to use this API to like or comment a activity?
Thanks
Qian

So Qian;
looking through the code this is how you can
Post a comment (POST)
/rest/api/activities/services/{serviceId}/objectTypes/{objectType}/objects/({objectId})/comments?startIndex={startIndex}&itemsPerPage={itemsPerPage}&utoken=blah
{key:val}
{text:'this is my comment)
Edit a comment (PUT)
So I haven't tried it but it should do the trick.. although I don't see update under capabilities so you may get blocked.
/rest/api/activities/services/{serviceId}/objectTypes/{objectType}/objects/({objectId})/comments?startIndex={startIndex}&itemsPerPage={itemsPerPage}&utoken=blah
id: {commentId},
text: 'changed my comment.. magic'
Delete a comment (DELETE)
/rest/api/activities/services/{serviceId}/objectTypes/groupSpace/objects/({objectId})/comments/{commentId}?utoken=blah
Like POST
/rest/api/activities/services/{serviceId}/objectTypes/{objectType}/objects/({objectId})/likes?startIndex={startIndex}&itemsPerPage={itemsPerPage}&utoken=blah
I passed it an empty object {} seemed to work for me.
Unlike (DELETE)
/rest/api/activities/services/oracle.webcenter.community/objectTypes/groupSpace/objects/({objectId})/likes/({likeId})?utoken=blah
Let me know if this works for you

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