Social networking sites can be best used for advertising. The important thing that you should care of is that don't make your social media blog - your marketing blog - have information only about you and your products/services.
It should have generic and interesting content which would attract your target sector.
Select social media sites where your target customers will be. Create contacts/connections by following people and initiating communication. Then have contents posted on social media sites which would interest your target sector and carefully get leads from that.
It's also important to monitor and concentrate on the appropriate channel.

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Profit is the difference between income and expenses.

Income is what a business has earned for products or services that they have sold. Income can also include interest or investment earnings and various other things that a business can do to make money.

Expenses are most things that a business pays for.

Usually on a financial statement there is "Profit before taxes" and Net Profit. Profit before taxes does not contain income tax owed by the business for that fiscal year.

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