To simply run a webinar, there are options available like GoToWebinar, GatherPlace, Freebinar, WebEx and many more. All you need to do is set a date for the webinar and send invitees a link to a sign-up page.
Google+:
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webinar don't always attend the webinar. Adopt measures to convert these registrants to attendees.

After making a comprehensive layout for your webinar, the next thing you should do is promote it. Using social media, Facebook ads and LinkedIn groups are examples of advertising platforms which you use for your marketing campaign. There is always an extra chance of capturing leads if you pay more attention to your promotional strategies and advertising.
Twitter:

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