By using the search functionality within a twitter stream, users can filter for: Tweets containing keywords and key phrases, Tweets from specific users, Tweets containing @mentions, Tweets from specific locations.  <span>The secret to using Twitter effectively is using the Twitter lists. </span>Each Twitter list you create, gives you a different Twitter stream, customized to your liking. It will only include tweets sent out by those accounts you have added to the list
        
             
        
        
        
Real-Time Operating System –
These types of OSs serves the real-time systems. The time interval required to process and respond to inputs is very small. This time interval is called response time.
Real-time systems are used when there are time requirements are very strict like missile systems, air traffic control systems, robots etc.
https://www.geeksforgeeks.org/operating-system-types-operating-systems-awaiting-author/
        
             
        
        
        
I really think it A : pager 
I hope this helps !!
        
             
        
        
        
Answer:
Shortened versions of phrases Ex:(l ol, s mh, i dk, ect.) 
Explanation:
Hope that this helps, if you have any more question please feel free to contact me, hope you have an amazing rest of your day. ;D