Question: I am executing selenium webdriver scripts through jenkins and logging some info through logger.info. On console output of jenkins it is showing as [testng] 2014-10-28 23:52:29,868 (pool-1-thread-2). I am not able to figure it out what "868" is referring to? 

I looked at line no in source code but no it is not the same so it is something different.

Answer: 
As Rahul said, i haven´t find a clean way to detect if someone has follow my instagram account, but the algorithm recommended wouldn't work as expected. 

I would recommend to store a list of followers, then (lets suppose 5 mins later) ask the api for a new list of followers and compare if you have someone new. Because, only by checking the number of followers you would be missing new followers, a good example would be if at the same time someone follows and another one unfollows. Hope this helps. I dont know about PHP but PYTHON has a nice built in function to compare lists.
I think there is no direct method but you can try this algorithm. 

1. Store number of followers a user has.
2. Now when you check for new followers find the **difference** in number of followers with current and saved number.
3. Let's say if '**three**' is the difference then, in the API Endpoint get the first three followers of the user. And they are the new followers.