You give no details about your business, so it is difficult to say. Every business and segment of customers uses different types of communication as a preference.
You should find out what they are using instead of asking them to use something you want to use. That is what works.
The options you have available are expanding everyday - so with that respect you just have to stay ahead, find out where your customers are putting their attention as opposed to asking them to put it somewhere.
E.g. depending on your market, customers will spend more time on linkedin.com or facebook.com for their socializing.
Find out what your customers do, then follow...
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