SEM - Search Engine Marketing - is the practice of using paid advertising on search engines (primarily Google Ads) to appear prominently in search results for targeted keywords. While SEM and influencer marketing are often managed as separate channels, they are most powerful when used together: influencer content generates demand that SEM captures.
What is SEM?
SEM refers specifically to paid search advertising - paying for placement at the top or bottom of search engine results pages (SERPs) for relevant queries. When a user searches for "best moisturiser for dry skin," brands running SEM campaigns for related keywords can appear prominently above the organic results with a paid ad.
The dominant SEM platform is Google Ads (formerly Google AdWords), operating on a pay-per-click (PPC) model: the brand pays only when a user clicks on the ad. Bing Ads (Microsoft Advertising) is the second-largest platform.
SEM is sometimes used as a broader term encompassing both paid search (PPC) and SEO (organic search optimisation), but in most industry usage, SEM specifically refers to the paid component.
Key SEM Concepts
- Keywords - the search terms the brand bids on
- Quality Score - Google's rating of ad relevance; higher quality scores reduce cost-per-click
- CPC (Cost Per Click) - the amount paid each time a user clicks the ad
- CTR (Click-Through Rate) - the percentage of users who see the ad and click it
- Conversion rate - the percentage of clicks that result in a desired action
- ROAS (Return on Ad Spend) - revenue generated per dollar of SEM spend
SEM and Influencer Marketing: The Demand Capture Relationship
Influencer marketing and SEM operate at different stages of the customer journey:
- Influencer marketing creates demand - it introduces people to a brand who weren't actively searching for it
- SEM captures demand - it reaches people who are actively searching, including those whose awareness was first triggered by an influencer
This creates a measurable synergy: brands running influencer campaigns typically see increased branded search volume (more people searching the brand name) during and after the campaign. SEM ensures that this brand-curious traffic, which would otherwise land wherever Google's algorithm sends it, is captured and converted efficiently.
Best practice: When launching a major influencer campaign, increase branded keyword bids in SEM to capture the uplift in branded searches. Also bid on non-branded category keywords to capture the consideration-stage searches that influencer awareness triggers.
Measuring the SEM Lift from Influencer Campaigns
Compare branded search impression volume (visible in Google Search Console) before, during, and after influencer campaign periods. A meaningful lift in branded searches - without a corresponding increase in other marketing activity - provides evidence of the influencer campaign's awareness effect.
