How to get the number of community members from outside the community

Question

Hi everyone.
I need to know if there is any way to get the number of community members from outside the community, I mean, not using the "What's happening" webpart. I want to build up a page with a Webpart that summarize my three most visited communities indicating
number of members, three last messages in the newsfeed, and number of posts in blog, wikis, document libraries, etc.
Do I need statistics to get this kind of information? Should I use Sharepoint Object model instead?
Here is an example of what I need:
- Community name
- Number of members
- Community activity (messages, docs uploaded to library, etc)
- Number of posts in calendar, blog, wiki that belongs to community
Thank you all!

Answer 1

Hi Thuan.
Thanks for your answer but it does not help me because these communities are Sharepoint Communities not external sites so I need to get that information using SP object model and BCS in this case is useless.
EDIT
I found the solution using the search objects but I was only able to get members, discussions and replies
using (ClientContext clientContext = new ClientContext("URL_OF_ENTERPRISE_SEARCH_CENTER"))
KeywordQuery keywordQuery = new KeywordQuery(clientContext);
keywordQuery.QueryText = "The_Name_of_the_Community WebTemplate:COMMUNITY";
SearchExecutor searchExecutor = new SearchExecutor(clientContext);
ClientResult<ResultTableCollection> results = searchExecutor.ExecuteQuery(keywordQuery);
clientContext.ExecuteQuery();
System.Collections.Generic.IDictionary<string, object> ret = null;
foreach (System.Collections.Generic.Dictionary<string, object> resultRow in results.Value[0].ResultRows)
Console.WriteLine("{0}: {1} ({2})", resultRow["CommunityMembersCount"], resultRow["CommunityTopicsCount"], resultRow["CommunitiyRepliesCount"]);
This is a Console Application.
I hope someone helps