Social Networks like Facebook, LinkedIn, and Twitter have throttle limits by default. Every user has a certain amount of requests they can send (via Nimble) to the servers. This ensures a good user experience for all the users in the network. If you receive a message from Nimble, "You have reached the maximum number of requests. Information and updates from this network may be unavailable to you for a short time", it means you have reached the request limit set by Facebook, LinkedIn, or Twitter. Typically, the limit gets reset every 24 hours and you can re-engage in those activities. 

Such type of activities that have throttle limits include:
- Sending social network messages
- Viewing profile details via the social hover popup
- Updating social network statuses 
- Searching users in the social network