Introductions - How to Strategically Expand Your Network

How can you strategically expand your network to include friends or friends using introductions intelligently? What i encourage a lot of people do when it comes to asking for introductions is to a broader approach, you never know where it's going to go. If you start asking lots of different connections, hey, who do you know in blank? With blank being the industry, the sector, the city that you want to get to know more people in.