There are almost infinite amount of places one can advertise on. From a loud billboard over a highway or as simple as a sticker on a wall, advertisements are everywhere. Currently, you are exposed to tens if not hundreds of ads and in one day, you could face almost a thousand advertisements. Well, as a marketer, you would want to hit not only the highest traffic areas but also a high-quality one. There are a few places to advertise online which could potentially bring your brand a large audience.

Let us understand a few words before moving on.
Cost-per-click (CPC) = cost of an ad is charged only when it’s clicked.
Enhanced-cost-per-click (ECPC) = similar to CPC but this option will automatically raise or lower the max CPC bid that you have set up initially from analysing the conversion rate.
Cost-per-mille (CPM) [Mille means a thousand in Latin] = cost of an ad is calculated by dividing the cost of an advertising placement by the number of impressions.
Cost-per-acquisition (CPA) = cost for every successful conversion resulting from that ad.
Now we got the nitty-gritty words aside, the first avenue of advertising is the AdWords. In general, cost of advertising on AdWords is controlled by you. There's no minimum amount that you have to spend and you set your own daily budget. Having a target market would help your ads to appear to specific groups and actions that are on Google. AdWords works on CPC, CPM for Display Network campaigns and CPA.

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Next, Linkedin ads. Works on CPC and CPM. With both options, Linkedin will suggest the bidding price to you from gathering information of other bidders targeting the same audience. Of course, the higher you bid in this range, the more likely you are to 
Linkedin charges a one-time fee of 5 dollars to post up an ad. This 5 dollars becomes ad credit which covers the initial clicks or impressions after the ad is posted. Once the credit is depleted, you'll be billed periodically for the impressions or clicks that your ad incurs. You'll continue to be billed through the end date of the ad or until you manually turn it off.
As for a bigger, high-roller kind of advertising; there is the log-out screen ad for Facebook costs around 100,000 dollars. A Yahoo homepage takeover cost around 450,000 dollars, YouTube page takeover is about 400,000 dollars, Twitter promoted trending topic is 120,000 dollars and AOL homepage takeover is 400,000 dollars. A homepage takeover would look something like this:
            
The biggest factors that affects price of a homepage takeover include:
1. Timing/Date
2. Total investment
3. Audience makeup
4. Quantity of ads on the page
5. Impact of the ad
In general, online advertising works on CPC and CPM. Make sure you keep track of your advertising campaign from the moment it starts. The main reason of advertising is to get as much exposure and revenue for your company. If the cost of advertising isn’t paying off, you should review the strategy and target market of the campaign. More importantly, if you fail to plan, you plan to fail.
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Jennifer Lancaster, Marketing Manager at Power Of Words
PPC is fraught with difficulty, so knowing the basics which Han has explained well, is just the start. When selecting your marketplace for advertising, try to envisage whether a small conversion rate like 2% (commonly experienced) will be enough to cover the extra visits, and whether people frequenting LI or Facebook are serious buyers for your business.
Phil Khor, Founder at ONETOUCH ACCOUNTING SOLUTIONS
What an awesome article packed with bucket loads of good information of how to advertise online, where to advertise, and associated advertising cost. Thanks for sharing Han. :)